Oil-stove chimney and drum



Mair. 6, 1923. 7 11,447,662

R. HOFFMAN OIL STOVE CHIMNEY AND DRUM Filed Feb. 8, 1918 be heated.

Patented Mar. 6, 1923.

UNETE'D STATES earlier orrica.

RUDOLPH HOFFMAN, 0F KANKAKEE ILLINOIS, ASSIGNOB TO SEARS, ROEBUCK AND COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK.

OIL-STOVE CHIMNEY AND DRUM.

Application filed February 8, 1918. Serial No. 215,948.

To all whom/it may concern-.-

Be it known that I, RUDOLPH HOFFMAN, a citizen of the United States, residing at Kankakee, in the county of Kankakee and State of Illinois, have invented certain new and useful Improvements in Oil-Stove Chimneys and Drums, of which the following is a specification.

The burners of oil stoves are provided with chimneys for directing the current of heated air and products of combustion to a point close to the utensil to be heated. Much heat, however, is radiated from the chimney and lost. vention is to minimize such radiation and insure that as much as possible of the heat generated by the burner shall be applied to useful work.

In the drawings, Figure 1 is a fragmental vertical sectional view of an oil stove em bodying the features of my invention. Fig. 2 is a fragmental front elevation. .Fig. is afragmental inner side view of the chimney. Fig. t is a top plan view of the chimney and the drum.

In the drawings, 1 denotes a blue-flame wick oil burner of any suitable type, as, for example, that shown in Patent No. 1,092,262, dated April 7, 1914. 2 is a. chimney of any ordinary or desired form resting upon an annular'shoulder 3 upon the burner. la stove top provided with the usual grate 5 to support the utensil or other article to The chimney 2 extends relatively near the stove top t so as to conduct the heated air and combustion products close to the bottom of the vessel to be heated.

To minimize the radiation of heat from the chimney 2 I surround the chimney with a cylindrical drum 6. The chimney 2 is shown as being upwardly tapered, so as to provide an annular space 7 between the chimney and the drum. To provide for the entrance of ail to the space 7 a suitable number of openings 8 are formed in the lower portion of the drum.

The lower ends of the chimney and the drum are connected together by bending the lower edge 9 of the chimney outwardly and upwardly into contact with the lower end of the drum, the latter being tightly clamped to the chimney. It will be seen that the chimney and the drum are adapted to stand upon the single shoulder or seat 3.

The upper ends of the chimney and the The object of this indrum are rigidly connected together and braced by means of two rings 10 and 11 and braces 12. The ring 10 overlies the drum 6 and is folded to embrace the out-turned annular flange 13 of the drum. The ring 11 overlies the chimney and comprises an annular downwardly extending flange 1+1- fitting tightly within the upper end of the chimney. The rings 10 and 11 and the braces 12 are preferably formed from an integral piece of sheet metal.

handle 15 of any preferred construction is attached to the drum. Herein the handle is shown as secured in place by bolts 16 and 17 extending through the drum and the chimney, and nuts 18.

Two openings 19 are formed in the chimney, said openings constituting awindow having a central stile 20. Opposite said window is an opening 21 in the drum. 22 is a sheet-metal window frame secured to the drum by the bolts 16 and 17. Sand window frame has a central stile 23. The openings 19 are covered with a sheet of mica 24 which is held in place by inwardly projecting lugs 25 on the window frame 22, including the stile 23 of the latter. The lugs 25 clamp the sheet of mica against the chimney 2 and the stile 20. The bolts 16 and 17 thus serve to attach the handle 15, the window frame 22 and the mica 24 to the chimney and drum structure.

In use, the hot gases are directed to the grate 5 by the chimney 2. The heat radiated from the chimney warms the air in the space 7, and causes an upward current of air in said space, said heated current being discharged close to the utensil being heated. The icomparatively cool air drawn in through the openings 8 prevents overheating of the burner and the lower part of the chimney. lVhen the burner is to be lighted, the drum and the chimney are tilted by means of the handle 15 to allow access to the wick.

I claim as my invention:

The combination with a blue flame oil burner for cooking stores, of an upwardly tapering chimney of substantial length. a cylindrical drum encircling the chimney so as to provide an annular air space around it serving to prevent the radiation of heat from the chimney, the lower end of said drum being of a diameter adapted to receive snugly the lower end of the chimney,

said burner having a cylindricalupper portion over which the lower end of the chimney is adapted to fit and an annular vshoulder providing a seat for the lower ends of the chimney and drum, the upper ends of said chimney and drum terminating approximately in the same horizontal plane, and

, relation.

means for rigidly securing the upper ends of the chimney and drum together in spaced a 10 In testimony whereof, I have hereunto set my hand.

RUDOLPH HOFFMAN. 

